电流密度对镁合金微弧氧化膜结构和性能的影响
Effect of Electric Current Density on Structure and Properties of Microarc Oxidation Catings on Magnesium Aloy

梁军郝京诚

文摘	电流密度是影响微弧氧化膜层结构和性能的主要因素之一.采用测厚仪、扫描电镜(SEM)、电化学测试等手段研究了AM60B镁合金在不同电流密度下硅酸盐溶液中微弧氧化膜层的结构和耐蚀性能.结果表明,随电流密度的增大,氧化膜厚度呈线性增加;氧化膜的表面微孔数目减少,微裂纹扩展程度增大.电化学腐蚀测试结果显示,电流密度9.0 A/dm~2下生成的氧化膜耐蚀性最好,主要与膜层较致密的微观结构有关.
其他语种文摘	Current density is one of the key factors influencing the structure and properties of microarc oxidation coatings. Thus microarc oxidation coatings were prepared on AM60B magnesium alloy from a silicate electrolyte at different current density. The effects of the current density on the structure and corrosion resistance of the microarc oxidation coatings were investigated using a thickness meter, scanning electron microscope, and electrochemical device. The results showed that the coating thickness increased linearly with the increasing current density. The micro-structure of the coatings was highly dependent on the current density. The number of the micropores on the coating surface decreased and the micro-cracks were enlarged with increasing current density. Moreover, the coating formed at a current density of 9.0 A/dm~2 had the best corrosion resistance, which was attributed to its compact microstructure.
来源	材料保护 ,2007,40(8):24-26,29 【核心库】
关键词	镁合金 ; 微弧氧化 ; 电流密度 ; 微观结构 ; 耐蚀性
地址	中国科学院兰州化学物理研究所, 固体润滑国家重点实验室, 甘肃, 兰州, 730000
语种	中文
文献类型	研究性论文
ISSN	1001-1560
学科	金属学与金属工艺
基金	国家自然科学基金创新研究群体项目
文献收藏号	CSCD:2854684